Well, the motive itself (being fascinated/wildly in love by someone otherworldly, mysterious stranger and so on) is quite popular in fairytales. People are often drawn to someone who impersonates something they don't have, who seems to have a secret at a very core of their being.
You could of course see it as pure posesiveness - he wants to keep her, whatever the price she would have to pay. But I disagree. At the beginning he does not see it as imprisoning her. Selkie IS half human, so she will just stay human forever. He does it in a sort of desperate hope, that it will work somehow without really hurting anyone. (The one who always chooses the loved ones rationally and never does anything stupid when in love let him throw the first stone). And it does seem to work at the start, right? It is said they were happy together. They both have to learn something - she learns, that she has a right to defend all aspects of her nature and protect herself from invasion - even if it is someone she loves she has to confront and he - that trying to bind someone this way is in fact hurting/killing them not loving them. They both do their homework so to speak. She has her skin back and she knows now that she cannot survive only partly herself, "without her skin" and he has children she gave him. It is a bitter happy ending but the best all things considered. (In some horrid versions the children drown following the Selkie, but in others they are said to sort of have the best of both worlds - they are "lucky" and competent fishermen/sailors/people of the sea and often - poets, understanding the language of the seals or the sea in general).
In psychology (if I understand correctly) marriage in fairy tales is often interpreted as sort of incorporating, internalizing various aspect of your psyche, sometimes the ones you struggled with. It is interesting to see Selkie stories that way, because they can show,that marriage is not always possible. We can live where say bears or wolves live, but we are totally incapable of breathing under water. Perhaps it would hint at that part in ourselves which always feels kind of out of this world, longing for what is behind the horizon, and that longing is impossible to satiate (or domesticate).It fascinates nonetheless.
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